Parsing a solute into model compounds using Met-Enkephalin (Acetyl-YGGFM-N-Methylamide) as an example. The six peptide units are shown in blue, cyan, green, yellow, orange and red, each using N-Methylacetamide as the model compound. The sidechains for the tyrosine, phenylalanine, and methionine residues are as indicated. The corresponding model compounds are p-Cresol (Tyr), Toluene (Phe), and Ethyl Methyl Thioether (Met). Details of the parsing are shown in Table I.